Made to order

Microtrac BELCAT II Chemisorption Catalyst Analyzer

With every system

Installation & training on-site setup, gas panel and BELCAT onboarding
NH₃-TPD or H₂ pulse on your own catalyst

Breakthrough curve measurement, Catalyst Evaluation, Gas Adsorption Measurement, Microtrac Particle Characterization · Chemisorption / temperature-programmed analysis (TPD/TPR/TPO)

Microtrac BELCAT II Chemisorption Catalyst Analyzer

Acid sites, reducibility, coke and metal dispersion of a solid catalyst on one automatic instrument — TPD, TPR, TPO and pulse chemisorption from −120 to 1200 °C.

Eight gas ports, mixtures blended inside the instrument
Breakthrough curves and BET; BELMASS II option to identify the gases
Installation and on-site training included · free test analysis of your catalyst
Configured to order · lead time from 4 weeks

Prices follow supplier cost and stock availability and are updated regularly. The price you see is today's price — once you order, it's held for 7 days.

Installation + training included Free test measurement

1200 °C max temperature

110 °C/min heating rate

8 gas connections

m/z 1–200 with BELMASS II

What your catalysis lab actually checks

Species, not just peaks

Pair the BELCAT II with the BELMASS II and every TPD or TPR peak comes with a mass spectrum — you see which gas desorbed, not only how much. Acidity, reducibility and metal dispersion by the methods your process and publications cite.

An applications engineer on the line

Method development for TPD, TPR, TPO and pulse chemisorption from engineers who run catalyst and adsorption analysis in-house at Additive Plus.

TPD·TPR·TPO·Pulse

Methods

–120 to 1200 °C

Temperature range

110 °C/min

Max heating rate

4-element TCD

Detector

1 (triple cell)

Sample ports

About this product

Price

Quoted to your configuration

The price depends on the options your chemistry needs — the CATCryo II low-temperature furnace, the vapor dosing unit, the external gas mixing unit, the BELMASS II mass spectrometer, AIRGUARD and the CO₂ probes for breakthrough work. You receive a formal quotation on our letterhead with configuration, price, payment terms and lead time: the document your purchasing department asks for. Installation and on-site operator training are included in every quotation. Lead time from 4 weeks, depending on the configuration; the quotation gives the date.

What you configure

BELCAT II base unit — 4-element thermal conductivity detector, split furnace to 1200 °C, eight gas ports including two corrosion-resistant lines
CATCryo II low-temperature furnace — sample temperature controlled from −120 °C with a liquid-nitrogen spray
Vapor dosing unit for H₂O, methanol, ethanol, toluene, benzene and other vapors
External gas mixing unit for three or more gases, corrosive gases supported
BELMASS II quadrupole mass spectrometer for evolved-gas analysis
AIRGUARD for samples that must not touch air; CO₂ and CO₂/H₂O probes for breakthrough curves
Installation and on-site operator training — included in every quotation

Next stepRequest a formal quotation

The test analysis of your catalyst is free: you get the report and we go through it with you before you decide.

−120 to 1200 °CWith the CATCryo II option; 1100 °C for regular use

110 °C/minHeating rate from 50 to 500 °C; 80 °C/min up to 1000 °C

8 gas portsGas mixtures blended inside the instrument, two lines corrosion-resistant

4-element TCDSemi-diffusion type with automatic zero-point adjustment

What the BELCAT II is

The BELCAT II is a fully automatic catalyst analyzer from Microtrac that works by the dynamic flow method. Gas flows through the sample cell while a compact split furnace runs a temperature program, and a thermal conductivity detector records how much gas the catalyst takes up or releases. From this the instrument reports acid and base sites, reducibility, oxidation behavior and coke, metal dispersion, BET surface area and, from breakthrough curves, the capacity of an adsorbent. Up to eight gases are connected at once and blended inside the instrument for pretreatment, analysis, pulses and calibration, so premixed cylinders are not needed. A sequential mode runs a series of measurements in a defined order without the operator.

Specifications

Measurement method	Dynamic flow method
Methods	TPD, TPR, TPO, TPX, TPSR, pulse chemisorption, BET, breakthrough curves
Detector	Semi-diffusion type 4-element thermal conductivity detector (TCD)
Measurement / pretreatment ports	1
Usable gases	He, Ar, N₂, O₂, H₂, CO, CO₂, NH₃, N₂O, NO and others
Gas port connections	8 in total · 3 carrier lines · 8 mix and pretreatment/pulse lines, 2 of them corrosion-resistant
Mass flow controllers (F.S.)	carrier 100 sccm · mix 30 sccm · pretreatment/pulse 100 sccm
Maximum temperature	1200 °C (1100 °C for regular use)
Heating rate	110 °C/min (50–500 °C) · 80 °C/min (50–1000 °C)
Cooling	400 → 50 °C in 30 min · 800 → 30 °C in 10 min with cryo cooling
CATCryo II (option)	down to −120 °C · LN₂ spray + heater · 10 L LN₂ reservoir
Vapor injection (option)	H₂O, CH₃OH, C₂H₅OH, toluene, benzene and others · 100 cc Pyrex bubbler, 3–100 °C
Gas supply	measurement gas 0.1 MPa (gauge) · compressed air 0.45–0.55 MPa (gauge), 1/8″ Swagelok
Power supply	single-phase AC 110 / 220 V
Dimensions (W × H × D)	500 × 750 × 500 mm (19.7 × 29.5 × 19.7 in)
Weight	80 kg (176 lb)
CE certified	yes
Installation and training	on site, included in every quotation
Lead time	from 4 weeks, depending on configuration

Download: BELCAT II datasheet (PDF)

What it tells you about a catalyst

Each method answers a different question about the active surface:

NH₃-TPD	amount and strength of acid sites on solid acid catalysts
CO₂-TPD	basic sites on solid base catalysts
H₂-TPR	reducibility and the interaction of metal oxides with their support
TPO	oxidation states and coke deposition
CO or H₂ pulses	metal dispersion, metal surface area and average metal particle size
Breakthrough curve	adsorption capacity of an adsorbent, for example for CO₂ capture

Examples from the Microtrac datasheet: an MFI zeolite gave 0.835 mmol/g of desorbed NH₃ with a peak at 440 °C; a Pt/Al₂O₃ catalyst measured with CO pulses gave 22.7 % metal dispersion, 1.13 m²/g metal surface area and a 4.99 nm metal particle size; a CO₂ breakthrough run gave 3.18 mmol/g adsorbed.

After each TPD or TPR run the software calibrates the detector automatically, using the instrument’s own mass flow controllers to generate several gas concentrations, and waveform deconvolution separates overlapping peaks.

Three families of measurement

Temperature-programmedTPD, TPR, TPO, TPX and TPSR. The sample is heated at a programmed rate while the detector follows the gas that desorbs or the reactant that is consumed: acidity, basicity, redox behavior, coke and reaction steps.

Pulse chemisorptionCO or H₂ is pulsed from a calibrated volume, with its own pressure and temperature sensors, until the metal surface is saturated. Mixtures are blended on demand without extra injection loops; baseline correction and pulse integration are automatic.

Breakthrough and BETBreakthrough curves for the capacity of adsorbents, with several components followed through the CO₂/H₂O probes or the BELMASS II. BET specific surface area by the flow method, after cooling the sample to liquid-nitrogen temperature.

Sequential mode combines pretreatment, thermochemical methods and catalyst testing steps in one workflow, and the vapor dosing unit, the external gas mixing unit and the cryogenic option can be added later in the field.

Where the BELCAT II stops — and what to take instead

The BELCAT II has one measurement and pretreatment port, so it works on one sample at a time; sequential mode automates a series of steps, not parallel samples. Its thermal conductivity detector tells you how much gas is released or consumed, not which gas — for that, add the BELMASS II mass spectrometer. Below room temperature you need the CATCryo II option, and 1100 °C is the limit for regular use. BET on the BELCAT II is a flow measurement of surface area; for full adsorption isotherms and pore size distribution, look at the BELSORP MAX X or the BELSORP MINI X.

In pictures

BELCAT II in a catalysis lab — Automated bench for temperature-programmed studies.

BELCAT II reactor detail — Reactor and furnace for TPD/TPR/TPO ramps.

BELCAT II with BELMASS mass spectrometer — Optional BELMASS II MS for evolved-gas analysis.

Availability, payment and delivery

Built to orderEach instrument is configured with the gas lines and options for your chemistry. Lead time is from 4 weeks after a confirmed order, depending on the configuration; the quotation states the date in writing.

How you payAsk for a formal quotation on our letterhead and pay against an invoice. We are registered in SAM.gov as a small business, so federal and university purchasing works the usual way.

What arrivesThe BELCAT II with the options you ordered, the BELCAT II software and the zeolite trap that removes moisture in TPR runs. You provide the gases and compressed air listed in the datasheet. Installation and on-site operator training are included in every quotation and carried out by Microtrac’s US service engineers.

Why buy it through Additive Plus

Authorized Microtrac resellerQuotation, order and delivery handled by one team in California

Installation and training includedSet up on site and your team trained on TPD, TPR, TPO and pulse chemisorption — part of every quotation

Free test analysisSend a sample of your catalyst and decide with the report in hand

What usually stops people — and the honest answer

“We only need NH₃-TPD for now.”The base unit runs it. The vapor dosing unit, the external gas mixing unit and the cryogenic option can be added in the field later, so you can start with what you need today.

“Premixed gas cylinders cost us a lot.”The BELCAT II blends mixtures inside the instrument from up to eight connected gases. In Microtrac’s comparison, its eight lines replace the 13 that single-purpose setups need for the same mixtures.

“Our TCD peaks overlap.”Waveform deconvolution separates overlapping peaks in the software. When you need to know which gas each peak is, the BELMASS II mass spectrometer identifies it.

“Our samples react with air.”The AIRGUARD option lets you handle samples without air contact, so moisture and oxygen do not change them before the measurement.

Ready when you are

Request a formal quotation

Brand	Microtrac
Technology	Chemisorption / temperature-programmed analysis (TPD/TPR/TPO)
Certification	CE
Weight	176 lb / 80 kg

Product data sheet (PDF)

pdf · 1492 KB

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Product videos

What our customers say

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Common questions

Don't see yours? Email [email protected] — NDA on request, typical reply within 4 hours.

Which analysis methods does the BELCAT II support?

The BELCAT II runs temperature-programmed desorption (TPD), reduction (TPR), oxidation (TPO), reaction (TPX) and surface reaction (TPSR), plus pulse chemisorption, BET surface area by the flow method and adsorption breakthrough curves. That covers acid sites (NH₃-TPD), basic sites (CO₂-TPD), reducibility (H₂-TPR), oxidation states and coke (TPO) and metal dispersion (CO or H₂ pulses) on one automatic instrument.

What temperature range and heating rates does it reach?

The furnace reaches 1200 °C, with 1100 °C for regular use. Heating rates are up to 110 °C/min from 50 to 500 °C and 80 °C/min from 50 to 1000 °C. Fan-assisted cooling brings the sample from 400 to 50 °C in 30 minutes. With the CATCryo II option the sample temperature is controlled from −120 °C, and cryo cooling takes it from 800 to 30 °C in 10 minutes.

How does the BELMASS II mass spectrometer add to the BELCAT II?

On its own the BELCAT II quantifies gas with a thermal conductivity detector. The BELMASS II quadrupole mass spectrometer (m/z 1–200) is linked to the BELCAT II software and identifies which species desorb or evolve during a run — for example hydrogen consumption and water production at the same time in a TPR — and enables breakthrough analysis with several components.

What detector does it use?

A semi-diffusion type 4-element thermal conductivity detector, temperature-controlled, with automatic zero-point adjustment for consistent baselines with different carrier gases. After TPD or TPR measurements the instrument runs an automatic multi-point calibration, generating several gas concentrations with its own mass flow controllers.

Which gases and samples can it handle?

Usable gases include He, Ar, N₂, O₂, H₂, CO, CO₂, NH₃, N₂O and NO. Eight gases can be connected at once; two of the lines are corrosion-resistant. The optional vapor dosing unit adds H₂O, methanol, ethanol, toluene, benzene and other vapors, and the AIRGUARD option lets you handle air-sensitive samples without air contact.

Can it measure breakthrough curves for adsorbents?

Yes. The BELCAT II measures adsorption breakthrough curves to determine the capacity of adsorbent materials. For DAC, CCUS and CCS work, multi-component breakthrough with gases such as CO₂ and H₂O is possible with the CO₂ or CO₂/H₂O probe options or with the BELMASS II. In a Microtrac example a CO₂ breakthrough run gave 3.18 mmol/g adsorbed.

Can it measure metal dispersion of a supported precious-metal catalyst?

Yes, by pulse chemisorption with CO or H₂. Gas is pulsed until the metal surface is saturated, and the software reports the adsorbed amount, metal dispersion, metal surface area and average metal particle size. In the Microtrac datasheet a Pt/Al₂O₃ catalyst gave 22.7 % dispersion, 1.13 m²/g metal surface area and a 4.99 nm metal particle size.

How much does a BELCAT II cost?

The price depends on the configuration — the base unit plus options such as the CATCryo II, vapor dosing, external gas mixing, the BELMASS II, AIRGUARD and breakthrough probes. Request a formal quotation and you receive configuration, price, payment terms and lead time on our letterhead. Installation and on-site operator training are included in every quotation.

Can I test my catalyst before buying?

Yes, and the test analysis is free. Send a representative sample; it is measured in Microtrac's US application lab and you receive the report, which we go through with you before you decide.

What is the lead time, and what comes with the BELCAT II?

The BELCAT II is configured to order. Lead time is from 4 weeks after a confirmed order, depending on the gas lines and options, and the formal quotation states the date. Installation and on-site operator training by Microtrac's US service engineers are included in every quotation.

Place your order, or talk to an engineer first

Order Microtrac BELCAT II Chemisorption Catalyst Analyzer direct, or talk to materials engineer

Add to cart

Microtrac BELCAT II Chemisorption Catalyst Analyzer

What your catalysis lab actually checks

Species, not just peaks

An applications engineer on the line

What the BELCAT II is

Specifications

What it tells you about a catalyst

Three families of measurement

Where the BELCAT II stops — and what to take instead

In pictures

Availability, payment and delivery

Why buy it through Additive Plus

What usually stops people — and the honest answer

Ready when you are

Product data sheet (PDF)

Product videos

Other products teams run alongside Microtrac BELCAT II Chemisorption Catalyst Analyzer

What our customers say

Common questions

Place your order, or talk to an engineer first